docker system df を使えばOK。 $ docker system df TYPE TOTAL ACTIVE SIZE RECLAIMABLE Images 157 22 39.25GB 36.31GB (92%) Containers 35 5 493.4MB 455.2MB (92%) Local Volumes 204 53 7.277GB 4.954GB (68%) Build Cache 0 0 0B 0B docker system df…