driver "btrfs" failed to remove root filesystem

[grabekm90]

Hello,
I appreciate your project - good step to build a secure world :)
I successfully run a container but there is a permission problem with removing it.

$ docker run --rm hello-world
Hello from Docker! 
This message shows that your installation appears to be working correctly.
(...)
ERRO[0001] Error waiting for container: container a6db41f4a33158aafd1a274cab987f34e2aa8c4e2c84eeee054c55af9e0f8d62: driver "btrfs" failed to remove root filesystem: Failed to destroy btrfs snapshot /var/lib/docker/100000.100000/btrfs/subvolumes for 770d8f4960022c2b2709b25c92945b6725694384016ecbece014642840d68550: operation not permitted

Docker version: 18.06.1~ce
LXD version: 3.9