The past fw years Apple has been developing APFS as the successor to the long-used HFS+ file-system. The Apple File-System is in use with macOS 10.13+ iOS 10.3, and their other platforms for offering a lot of features not found in HFS+ including much better performance. There is an open-source APFS kernel driver now under development for Linux in supporting this file-system…

Source: Phoronix – Read-Only Apple File-System Support Is Being Worked On For The Linux Kernel (APFS)