Well, I checked in /system/lib/modules to see if cifs.ko was there, but it's not. I was thinking maybe extracting the cifs modules from the ElementalX kernel might be possible, but it must be part of the kernel source and not a separate file. Seems like more people would find cifs support useful, so maybe somebody with development skills will make a kernel module file that's compatible with the N7 2013.
Here's what shows up when I run mount:
//192.168.0.100/Music /mnt/cifs/Music cifs rw,relatime,sec=ntlm,unc=\\192.168.0.100\Music,use rname=username,uid=0,noforceuid,gid=0,noforcegid,a ddr=192.168.0.100,file_mode=0755,dir_mode=0755,nou nix,serverino,rsize=16384,wsize=131007,actimeo=1 0 0