docker images --digests
REPOSITORY   TAG           DIGEST                                                                    IMAGE ID       CREATED         SIZE
nginx        1.15-alpine   sha256:385fbcf0f04621981df6c6f1abd896101eb61a439746ee2921b26abc78f45571   315798907716   5 days ago      17.8MB
nginx        alpine        sha256:f1ca87d9adb678b180c31bf21eb9798b043c22571f419ed844bca1d103f2a2f7   bf85f2b6bf52   13 months ago   15.5MB