Btrfs и OpenVZ/ploop

Не поддерживается, собака:

vzctl create 88811 --layout ploop --private /mnt/88811
Creating image: /mnt/88811.tmp/root.hdd/root.hdd size=5153024K
Creating delta /mnt/88811.tmp/root.hdd/root.hdd bs=2048 size=10307584 sectors v2
Storing /mnt/88811.tmp/root.hdd/DiskDescriptor.xml
Opening delta /mnt/88811.tmp/root.hdd/root.hdd
Adding delta dev=/dev/ploop56655 img=/mnt/88811.tmp/root.hdd/root.hdd (rw)
Error in add_delta (ploop.c:1171): Can't add image /mnt/88811.tmp/root.hdd/root.hdd: unsupported underlying filesystem
Failed to create image: Error in add_delta (ploop.c:1171): Can't add image /mnt/88811.tmp/root.hdd/root.hdd: unsupported underlying filesystem [3]
Destroying container private area: /mnt/88811
Creation of container private area failed