So after following the CIFS setup and examples in the FreeNAS online documentation I could not connect to the share in Windows 8. I must have setup permissions about 10 times before I decided to restart the CIFS service and that did the trick. So as a quick reminder, after you setup your CIFS share(s) go into Services → Control Services and turn CIFS off, wait a minute a two and turn it back on.

As a side note File History setup in Windows 8 works well with a FreeNAS CIFS share.