I tested quota reporting against a Win8 Server via cifs-utils 6.0 (on a Fedora box) with SMB2.0 and it's not quite what one might expect.

It glitches on the Used column returning what on the test server system looks
to be the remaining free space on the drive overall.  Guessing that it
is the result of mixing folder and drive sizes in the likely
calculation totalsize - freespace = used.  In this case the "folder"
total size approaches zero (100M) and the free space is the figure at
drive level not folder..hence the negative value below.

sudo mount -t cifs //testserver/test mnt/ --verbose -ouser=zzalsmf3,domain
=ds,uid=1000,gid=1000,vers=2.0

df -hv
Filesystem                         Size  Used Avail Use% Mounted on
//130.88.88.173/test               100M -160G   50M 101% /home/matt/mnt/isilon