I'm sorry, you're just wrong on this. I showed you there are 2 separate directories for containers & volumes. I also showed that docker rm container does not delete the volume. If you looked at my postings carefully, you'd see a detailed layout of all this.
It doesn't prove your point that the portainer_data folder was created when running the docker command. It's true that folder was created on first run, but it is not removed when the command is rerun.
I've done all I can to make this clear. I'm done. Thanks.