Samba, PAM and MySql auth

[Enrikoala]

Hi to all again, this is my second problem.
I've installed a Linux Ubuntu Server in my company and I've stored in separate folders the files of my emplojees that, of course, don't have a user in that machine.
The list of the users are in a MySql folder and the password are crypted with the PASSWORD() option of mysql.
I've activated with success the ftp service using PAM authentication and I would like do the same with samba.
I've tryed one month reading a lot of HowTo, posts, linux-guru, etc. but I'm still having the same result: no way!
My goal will be to share all the folders but I want every user could log only in his personal folder.
I'm really stressed about that! :-)
Could anyone help me please with some working examples?
Thanks anyway for interesting. Enrico