Docker system df

docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              20                  9                   11.57GB             5.315GB (45%)
Containers          9                   9                   1.02GB              0B (0%)
Local Volumes       9                   8                   3.255GB             3.037GB (93%)
Build Cache         0                   0                   0B                  0B