I used to map department shares that way until the down-sizing...

Then suddenly some users needed access to more than one dept share and that got ugly. Now I map at the DEPT folder (share) one level closer to the root and everyone sees only what they need through NTFS perms. It can't get any easier than that.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.