We will need it for btrfs handling. Also print out the
FS type for easier debug

 | (00.003545)     type unsupported (cgroup) source cgroup 1c / @ /sys/fs/cgroup/blkio flags 30000e options blkio,
 | (00.003558)     type unsupported (cgroup) source cgroup 1d / @ /sys/fs/cgroup/perf_event flags 30000e options perf_event,
 | (00.003571)     type unsupported (cgroup) source cgroup 1e / @ /sys/fs/cgroup/hugetlb flags 30000e options hugetlb,
 | (00.003584)     type unsupported (ext4) source /dev/sda2 800002 / @ / flags 300000 options data=ordered,
 | (00.003670)     type tmpfs (tmpfs) source tmpfs 20 / @ /tmp flags 100000 options
 | (00.003696)     type unsupported (mqueue) source mqueue d / @ /dev/mqueue flags 300000 options
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>