APFS Support Is Undone in 10.12.6
Sierra 10.12.6 addresses the previous problems with Apple’s new file system, APFS, by making it normalising, thus compatible with HFS+ file and folder naming.
Unfortunately, the update also breaks the tools provided in 10.12.4 and 10.12.5 for working with APFS, and Disk Utility is similarly incapable of even distinguishing between case-sensitive and case-insensitive variants of APFS. While 10.12.6 does read from and write to APFS volumes, it can do little more than that.
