SMB3.1.1 POSIX extensions - statfs

[Steve French]

With JRA's posix extensions info level prototype and my most recent
patches on the client all statfs fields are now filled in. With the
change to the client to retrieve f_fsid and f_namelen from another
SMB3 FS_INFO (fs_volume_info) request, the combination of this
information and two other fields filled in above (flags and type) -
the posix statfs takes care of all the remaining fields.

One minor caveat - Dave Howells is extending the statfs syscall, so we
will need to doublecheck that all of the new fields can be retrieved
with existing SMB3 infolevels

-- 
Thanks,

Steve