this is my situation:

ROOT
|
--------------------------------
| | | |
Dir1 Dir2 Dir3 Dir4

If user is member of Group_Dir1, his drive would be connected to \\Server\Dir1
If user is member of Group_Dir2, his drive would be connected to \\Server\Dir2
And so on....

But, if user is member of more than one group, lets say he's member of Group_Dir1 and Group_Dir3, his drive has to be connected to the root: \\Server\Root