Roll directories up to parent - sql

Question

Is there a way to roll data up that looks like this:
What I am looking for is this:
Y:\Data\FS02-V\Aetna\ETL | Data, development files
So rows two and three being children of row one should roll up to the parent and the parent should show all file types contained. I am working in sql server and this is the code that produces the source table:
SELECT
[MCL].[Category Description] As Category
, [SF].[Directory] as Directory
, CONVERT(BIGINT, [SF].[Length]) AS FileSize
, (SELECT MAX([Id]) FROM [dbo].[split](RIGHT([SF].[Directory],LEN([SF].[Directory])-1),'\')) AS [LevelsFromRoot]
FROM [dbo].[FS02V_SourceFiles] [SF]
INNER JOIN [dbo].[Extensions] [E]
ON [SF].[Extension] = [E].[Extension]
INNER JOIN [dbo].[MasterCategoryLookup] [MCL]
ON [MCL].CategoryID = [E].Category
ORDER BY [SF].[Directory]
Table def:
CREATE TABLE [dbo].[FS02V_SourceFiles](
[Length] [float] NULL,
[Directory] [nvarchar](255) NULL,
[Extension] [nvarchar](255) NULL,
[Type] [nvarchar](max) NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
CREATE TABLE [dbo].[Extensions](
[Extension] [nvarchar](255) NULL,
[Type] [nvarchar](max) NULL,
[Category] [int] NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
Split function:
ALTER FUNCTION [dbo].[Split]
(
#RowData nvarchar(max),
#SplitOn nvarchar(5)
)
RETURNS #RtnValue table
(
Id int identity(1,1),
Data nvarchar(max)
)
AS
BEGIN
Declare #Cnt int
Set #Cnt = 1
While (Charindex(#SplitOn,#RowData)>0)
Begin
Insert Into #RtnValue (data)
Select
Data = ltrim(rtrim(Substring(#RowData,1,Charindex(#SplitOn,#RowData)-1)))
Set #RowData = Substring(#RowData,Charindex(#SplitOn,#RowData)+1,len(#RowData))
Set #Cnt = #Cnt + 1
End
Insert Into #RtnValue (data)
Select Data = ltrim(rtrim(#RowData))
Return
END
The path(Directory) is stored as nvarchar and it should be the driver to roll up to the parent. I would assume the path needs to be split and my function is already doing something similar to get the path levels. I think this would be easier in SQL with my raw data but at the end of the day I am going to be visualizing this data in tableau so if anyone knows if its easier to use sql for this before I feed it into tableau or just use tableau with my source data I would try that as well.

Answer 1

Solution to this was simple:
Use abolve SQL to prepare the directories and group them with their respective files and then roll it up using Tableau and calculated fields.