Joint MS Domain Controller with Samba

Hi there,

recently I have had to install a domain controller with file server and print accounting for a group of win Xp clients.
I found that Linux domain controllers are not fully compatible in such LAN. But I desire to implement file sever in linux/samba.
Can anyone advise me if it possible to make a collaboration between these two?
the problem is that permissions that windows server sets for each user, linux can not understand. So, each user has access to other users folders.

Regards,