EFI drivers for Clover to boot APFS partitions.
The drivers apfs.efi are from official Installers (can be located through Show Package Contents)
High Sierra Public Beta (don't remember which version though)
High Sierra release (26 Sept 2017)
High Sierra security update (Oct 05 2017)
Files are originally named apfs.efi, I put the version number before .efi for convince.