How to see the writable layer of a container?

Question

Docker

I started the container. He wrote something to files in his FS. How can I get a list of changed files (possible from the host)?

Answer 1

Thanks Dmitry found
docker inspect <container id> | grep UpperDir

Answer 2

/var/lib/docker/volumes/

there it saves volumes of containers.
If you don't have many, it's easy to manually find the one you need.