SMB Share for XMBC

Today I put my old XBOX on my Airport Extreme (n) network, and configured XBMC to connect to the attached Airport Disk using SMB protocol. It went without a hitch, except that when browsing the Airport Disk within XMBC, I can only see files if they are in the root of the share. For example;

- The volume in the Airport Disk is called "Storage", therefore this is the default SMB share. Within "Storage", I have several folders; Movies, TV Shows, Music etc. If there is a file in "Storage", XBMC has no trouble seeing it. If, on the other hand, I navigate to ANY of the folders within, XBMC does not see the files.

I don't know enough about SMB shares, but I wonder if there would be permission issues accessing files within these folders. Could it be that I need to create an SMB Share for each folder? Being an Airport Disk, I can't figure out how to do that! Snow Leopard doesn't have any Directory Access, or other such utilities, but even if it did, how could I configure shares on the Airport Disk?

Perhaps I'm barking up the wrong tree altogether, and I can certainly use the share as-is, simply by moving files to the root, but it's a pretty lousy way to work-around what should be a simple process!

I did consider creating the shares from one of the G5's on the network, and simply keeping the disk mounted, but again this did not seem a very elegant solution...

Any advice with regards to creating SMB shares on my Airport Disk (besides the default), or other advice to help me with this, I'd much appreciate it.

Thanks!