Checking used storage space on Docker (--verbose or -v for more detailed space info):

Checking used storage space on Docker (--verbose or -v for more detailed space info):
* Containers: docker ps -a --size
* Images: docker image ls or docker images
* All-round: docker system df
References:
* How to analyze disk usage of a Docker container: https://stackoverflow.com/questions/26753087/how-to-analyze-disk-usage-of-a-docker-container
* Analyze Disk Usage of a Docker Container: https://www.baeldung.com/linux/docker-container-disk-usage
* How to Check Disk Space Usage for Docker Images, Containers and Volumes: https://linuxhandbook.com/docker-disk-space-usage/
* 2 Commands to Quickly View Docker Disk Space Usage: https://codeopolis.com/posts/commands-to-view-docker-disk-space-usage/
* Docker Tip #44: Show Total Disk Space Used by Docker: https://nickjanetakis.com/blog/docker-tip-44-show-total-disk-space-used-by-docker
Note that somehow all these commands still don't fully match up to the usage of the /var/lib/docker/overlay2/ folder (?):
* Overlay2 Taking too much space: https://forums.docker.com/t/overlay2-taking-too-much-space/134417