'zfs get all' returns properties for file systems with '%' (percent sign) appended
Solution 1:
Filesystems with a %
character in them are shares of some sort. You can see the share properties for all shared filesystems with zfs get share.all
This is documented in the man page for zfs_share: "A file system's automatic share name displays as filesystem%. For example, tank/home%."
That style of documenting something is typical of Sun/Solaris. Something will be mentioned once, buried in some obscure place. The nice thing is the documentation never contradicts itself, and it's always been correct in my experience. The bad thing about that style of documentation is finding what you're looking for.