Docker and LXD/LXC

I read that the base (layer 1) images of the docker were LXC images and that this docker was using LXC under the hood

If it is true. How to transform an lxd image into a docker image?

Afaik this was “long” ago. They now use their own “libcontainer”-software instead of lxc.

Only solution I see (for containers and images alike):
It might be possible to use the filesystem:

Other options need to be applied manually, as the features of LXD and Docker will differ (I assume; haven’t used docker in recent time).

Ok thanks for the answer. It’s unfortunate that it’s no longer with lxc