zfs-auto-snapshot with the default crontabs running on 16.04 LTS. This will auto snap every zfs filesystem you have with com.sun:auto-snapshot=true set. https://github.com/zfsonlinux/zfs-auto-snapshot
zfsautosnap:
restart: always
image: jayjanssen/zfs-auto-snapshot
devices:
- "/dev/zfs:/dev/zfs"
volumes:
- /etc/localtime:/etc/localtime:ro