How to add a network share as storage to BE2012?

I have a NFS storage on linux server that I'd like to add to BE 2012 server running on a Win2008R2. I can access the share from windows via Samba.

Now how do I use it?

I am also interested in "Linux Media server" option. Bascially, I see my linux server RHEL6.2 in the storage devices but I cannot choose the path to backup.

Any ideas?