You can get this from docker stats e.g:
$ docker stats --no-stream
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
6b5c0fcfa7d4 0.13% 2.203 MiB / 4 MiB 55.08% 5.223 kB / 648 B 102.4 kB / 876.5 kB 3