br_netfilter module is already enabled on your VPS.
There's a couple of different things you can try, such as disabling ICC entirely: https://success.docker.com/article/can-i-disable-inter-container-communication-icc-in-docker-ee and we've been informed that the fix listed on https://github.com/lxc/lxd/issues/2321 where you set a .dockerenv file is successful too.
To create the file, you can run the following command on SSH:
touch /.dockerenv