How to remove unwanted nodes from /DFileBrowser/ ?

[dvd_video]

Simply as is says guys.
I made a file browser that scans the data folder of Gmod and on file select gets the file location. The thing is that I only want certain folders to be displayed there nat all the folders from the data folder. Like the E2 folder and my custom folder.
concommand.Add(gsToolPrefix.."configurator",
    function(oPly,oCom,oArgs)
      -- http://wiki.garrysmod.com/page/Enums/KEY
      -- To draw sensor beams after list view add: https://github.com/Facepunch/garrysmod/blob/master/garrysmod/lua/vgui/dmodelpanel.lua
      local scrW = surface.ScreenWidth()
      local scrH = surface.ScreenHeight()
      local nRat = hoverlib.GetOpVar("GOLDEN_RATIO")
      local xyPos, xyDsz = {x=(scrW / 4), y=(scrH / 4)}, {x=5, y=5}
      local xySiz = {x=math.floor((scrW/(1 + nRat))*nRat), y=0}
      xySiz.y = math.floor(xySiz.x / (1 + nRat))
      local pnFrame, lvLen = vgui.Create("DFrame"), 100 -- List view width
      if(not IsValid(pnFrame)) then pnFrame:Close()
        return logStatus("CONFIGURATOR: Main panel invalid", nil) end
      pnFrame:SetPos(xyPos.x, xyPos.y)
      pnFrame:SetSize(xySiz.x, xySiz.y)
      pnFrame:SetTitle(language.GetPhrase("tool."..gsToolName..".menu_name").." {"..gsScriptVer.."}")
      pnFrame:SetVisible(true)
      pnFrame:SetDraggable(true)
      pnFrame:SetDeleteOnClose(true)
      pnFrame:Center()
      pnFrame:MakePopup()
      local pnFile = vgui.Create("DFileBrowser", pnFrame)
      if(not IsValid(pnFile)) then pnFrame:Close()
        return logStatus("CONFIGURATOR: File browser invalid", nil) end
      pnFile:Dock(FILL) -- http://wiki.garrysmod.com/page/Category:DFileBrowser
      pnFile:SetName(language.GetPhrase("tool."..gsToolName..".menu_name"))
      pnFile:SetPath("GAME")
      pnFile:SetBaseFolder("data")
      pnFile:SetCurrentFolder(gsDirpathBase..gsDirpathSave)
      pnFile:SetFileTypes("*.txt") -- File type filter
      pnFile:SetOpen(true) -- Remove the leading "data/"
      pnFile.Divider:SetLeftWidth(xySiz.x * (1 - (nRat - 1)))
      pnFile.OnSelect = function(pnSelf, sPath, oPnl)
        local sSrc = gsInitFile..sPath:sub(6,-1)
        RunConsoleCommand(gsToolPrefix.."source", sSrc)
        logStatus("CONFIGURATOR: File <"..sSrc..">")
      end
      local pnNode, ID = pnFile:GetFolderNode(), 0
      if(not IsValid(pnNode)) then pnFrame:Close()
        return logStatus("CONFIGURATOR: File node invalid <"..tostring(pnNode)..">", nil) end
      local pnChil = pnNode:GetChildNode(ID)
      if(not IsValid(pnChil)) then pnFrame:Close()
        return logStatus("CONFIGURATOR: No children", nil) end
      while(pnChil) do
        logStatus("CONFIGURATOR: Child <"..pnChil:GetName().."> "..tostring(pnChil))
        ID = ID + 1; pnChil = pnNode:GetChildNode(ID)
        if(not IsValid(pnChil)) then break end
      end
  end)

I am using ( DFileBrowser ) and I want to cycle trough all the folder nodes that I do not need and remove them, so I can only leave there my custom folder and the E2 folder. I see that the panel is created here ans later on I can retrieve the root using this and all its folders by ID using this.
In the logs I receiving:
CLIENT > [21-01-18 14:05:33:160.063863] CONFIGURATOR: File node invalid <nil>
How do I do that ?

[Rubat]

Instead of using data/ use data/myspecialfolder/ as the root for the DTree problem solved?

[dvd_video]

Yep, that works as a charm, but I am generating some stuff using the wiremod and I want to inclue E2files/Expression2 folder as well.