Docker not starting in your namespace?

Question

linux

Hello!
I do according to the official instructions to launch docker in my environment of names:
- create a testuser user, add him to the docker group;
- I configure the launch of the docker daemon in the namespace of the testuser user;
dockerd --userns-remap="testuser:testuser";
- I restart the daemon:
service docker restart - I run docker run hello-world
to check the namespace - I look at the contents of ls -ld /var/lib/docker/231072.231072/ and it's empty ....... Tell me what I'm doing wrong? Why a folder for the user environment is created, but docker is still running in its old environment