Problem with Samba configuration

[Sauro Cesaretti]

Hello Everyone,
I'm having a problem using samba server in ubuntu 9.10 and samba 3.
In particular, I'd like to allow that every user that is registered in
the machine will be able to logon and see its own folder only.
I have tried many ways but it seems that I'm going in the wrong
direction.
Tanks in advance for your big help and if you need an it is possible,
I'll share my configuration with yu.
Regards, Sauro