https://developer.apple.com/documentation/fskit/fsfilesystem still says  The current version of FSKit supports only FSUnaryFileSystem, not FSFileSystem. I used to think FSUnaryFileSystem only supports physical partitions, and FSFileSystem is needed for virtual or networked file systems. Are the docs out of date (that note has been there since Sequoia) or is my understanding wrong (it's pretty naive) or is something else going on? (I am not sure if Apple folks are still taking questions, if not I might ask on the main forum)