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BTRFS subvolumes

btrfs subvolume create /BTRFS/sub1
btrfs subvolume create /BTRFS/sub2
btrfs subvolume create /BTRFS/sub3
btrfs subvolume list /BTRFS
ID 256 gen 234 top level 5 path sub1
ID 257 gen 227 top level 5 path sub2
ID 258 gen 228 top level 5 path sub3

Mount subvolume 

mount -o subvol=sv1/sv12 /dev/sdb /mnt

Getting data size on each subcvolume: