$ mount | grep btrfs
/dev/mapper/vg-system on / type btrfs (rw,relatime,compress=lzo,ssd,space_cache,subvolid=260,subvol=/root)
/dev/mapper/vg-system on /home type btrfs (rw,relatime,compress=lzo,ssd,space_cache,subvolid=261,subvol=/home)
/dev/mapper/vg-system on /var/lib/docker/btrfs type btrfs (rw,relatime,compress=lzo,ssd,space_cache,subvolid=260,subvol=/root/var/lib/docker/btrfs)
$ sudo mount -o compress=lzo,ssd,space_cache /dev/mapper/vg-system /mnt
[sudo] password for user:
$ cd /mnt
$ ll
total 0
drwxr-xr-x 1 root root 10 Rgp 11 21:07 home
drwxr-xr-x 1 root root 122 Rgp 12 14:45 root
drwxr-xr-x 1 root root 122 Rgp 12 14:45 root-2016-08-12
$ ll /
total 36
lrwxrwxrwx 1 root root 7 Rgs 30 2015 bin -> usr/bin
drwxr-xr-x 4 root root 4096 Sau 1 1970 boot
drwxr-xr-x 20 root root 3160 Spa 7 19:37 dev
drwxr-xr-x 1 root root 3820 Spa 7 20:03 etc
drwxr-xr-x 1 root root 10 Rgp 11 21:07 home
lrwxrwxrwx 1 root root 7 Rgs 30 2015 lib -> usr/lib
lrwxrwxrwx 1 root root 7 Rgs 30 2015 lib64 -> usr/lib
drwxr-xr-x 1 root root 46 Rgp 13 00:23 mnt
drwxr-xr-x 1 root root 50 Spa 4 20:19 opt
dr-xr-xr-x 209 root root 0 Spa 7 19:37 proc
drwxr-x--- 1 root root 122 Rgs 1 13:08 root
drwxr-xr-x 31 root root 820 Spa 8 18:04 run
lrwxrwxrwx 1 root root 7 Rgs 30 2015 sbin -> usr/bin
dr-xr-xr-x 13 root root 0 Spa 7 19:37 sys
drwxr-xr-x 1 root root 14 Rgs 30 2015 srv
drwxrwxrwt 12 root root 340 Spa 8 18:06 tmp
drwxr-xr-x 1 root root 80 Rgp 31 13:15 usr
drwxr-xr-x 1 root root 122 Rgp 22 00:17 var
$ sudo btrfs subvolume list /mnt | grep -v docker
ID 260 gen 82945 top level 5 path root
ID 261 gen 82945 top level 5 path home
ID 264 gen 239 top level 260 path root/var/lib/machines
ID 269 gen 2157 top level 5 path root-2016-08-12
