[Samba] Hiding shares from certain groups

[Mchristianjr at nbhandy.com]

I'm wondering if it would be possible to hide certain shares from all that 
don't belong to a relevant group.

in other words, say I have 3 shares Finance, Marketing, and Credit.  And 
lets say that their are 3 groups of the same name, and that each share has 
valid users = @{group} listed - or something to that effect.  Is it 
possible to hide the other two shares from even being seen?  I know that I 
can set browseable = No and then setup a mapped drive, but that would need 
to be done on 50+ PCs... 

Thanks - Mike Christian Jr.