Does anyone know if it's possible to have an Apple TV (3rd gen) play content from a NAS? At the moment I access all my content using home sharing from my iMac but having to store all my media on that machine is a pain in the dong. 
I've seen that a lot of NAS boxes have some kind of iTunes server in their spec sheets but from reading around I'm under the impression that wouldn't do the trick.
Any ideas?

I've seen that a lot of NAS boxes have some kind of iTunes server in their spec sheets but from reading around I'm under the impression that wouldn't do the trick.
Any ideas?
(even down to the same internals)