Bob Cadenza
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Bob Cadenza's post in Size of docker.img does not correlate to docker container/volume sizes. was marked as the answerOk so I have learned some. Firstly using du -sh inside /var/lib/docker the btrfs stuff doesn't get calculated correctly, so I have found that
docker system df --format 'There are \t {{.TotalCount}} \t {{.Type}} \t taking up ......{{.Size}}' shows the best account of the space used. In my case I had a large amount of build cache, so after deleting the build cache, I was able to clear a lot of space.