I
strongly recommend you edit your email address out of that post.
How about an alternative approach? Use this directory structure (e.g.):
/
--/home
--/departments
--/accounting
--/finance
--/sales
Map Y: to a Samba share pointing to
/home/departments. Users will then see accounting, finance and sales subfolders, but will only be able to access the folders to which they have group access.