I am currently new to linux and am in the process of substituting NT Servers with Linux. As I am currently learning about Samba, I cannot answer the question, but can offer a reference to a source that may be of some help. A good book on the subject of Samba, which is part of the Craig Hunt Linux Library is a book called:
"Linux Samba Server Administration"
As I learn more, I will hopefully be able to answer questions instead of giving references to solutions. Hope this was a point in the right direction.