In general since Disk Warrior is a third party tool designed to support file system on the Mac it is Alsoft's responsibility to be compatible with Apple and not the other way around. That said, developers have complained that Apple has been tardy in releasing the full APFS specifications, but Micromat's TechTool Pro can rebuild an APFS directory. Additionally Apple's Disk Utility > First Aid has become pretty robust and should be able to handle a directory rebuild in either APFS or HFS+ although you will have to run it from the Recovery Drive to repair the boot drive.
