For a long time zfSnap project has been inactive. There are issues and merge requests that haven't been processed.
If anyone would like to become zfSnap maintainer you can apply on github: https://github.com/zfsnap/zfsnap/issues/109
If anyone would like to become zfSnap maintainer you can apply on github: https://github.com/zfsnap/zfsnap/issues/109