But we also need to be careful about making assumptions that they are different. If APFS has been updated in Mojave in any significant way, then I would expect Apple to release a High Sierra update so its APFS version either matches or is compatible with the Mojave version. In the absence of such a High Sierra update, there would be the potential for APFS in High Sierra to not work well with APFS in Mojave. We have not heard anything about High Sierra's APFS implementation being updated, so I must therefore assume that any changes to APFS in Mojave are not significant, such that those changes would break compatibility with people using APFS under High Sierra.As for Tim Standing's presentation, I would like to add that it was made nearly a year ago and was based on the APFS implementation in macOS 10.13 High Sierra. Will consider that the first production version. Apple has updated macOS APFS for 10.14 Mojave. Will consider that another version. We need to be a bit careful in making assumptions for one being the same as the other.