Hi all, I'm currently running Snow Leopard inside Parallels under Mac OS 10.12 Sierra on a Mid 2010 Mac Pro. It runs very nicely too. However, I have been considering upgrading the Mac OS to 10.13 High Sierra, and my question is as follows: My start-up drive is an SSD, and I understand that installing High Sierra on an SSD drive will convert the drive format to APFS. I have also read that Apple's APFS format is not backwards compatible with operating systems prior to High Sierra. Does it therefore necessarily follow that Snow Leopard will no longer run on this drive, even as a VM within Parallels 15, once the drive been formatted as APFS? Thanks and regards.