[Samba] Access Samba Servers from the Internet?

[DrTebi]

Hello,
I have a little question that I am not sure about:
I will set up a server at a hosting facility, is it possible to install Samba 
on the server and access shares of this server over the internet?
Would I just have to use the right workgroup, maybe restrict access to 
certain IP's, and would I then be able to access the shares from just 
anywhere on the internet, as long as I have the correct workgroup???
This might be a silly question, but I haven't really seen an answer anywhere 
yet.

Thanks,
DrTebi