[Samba] does samba support multiple domains?crucial issue for ISP company

[Qin Zhen]

Hi samba users, 
we are an ISP companies running proxy, so the domains we need to work on are large amount, keeping increasing, and moreover belonging to different companies. so whether samba supports multiple domains is an important issue for us to decide whether to adopt samba with proxy. i googled online and found some notion that samba doesnt support multiple domains unless multiple instances of samba are installed. is it true? pls kindly advise. thanks a lot in advance.  

Regards, 
Pang