How can I change permission of /var/lib/docker/containers to make it world readable?

[alissa-tung]

I had tried chmod 755 /var/lib/docker/containers with docker exec -u 0, but it says chmod: changing permissions of '/var/lib/docker/containers': Read-only file system and other user still can not read it

[alissa-tung]

It's my fault, I should not mount it as ro