firmlink
File is a firmlink.
Declaration
static var firmlink: FileFlags { get }Discussion
Firmlinks are used by macOS to create transparent links between the read-only system volume and writable data volume. For example, the /Applications folder on the system volume is a firmlink to the /Applications folder on the data volume, allowing the user to see both system- and user-installed applications in a single folder.
The corresponding C constant is SF_FIRMLINK.