Implement querying of used space for APFS volumes on macOS #208
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Fixed #205
Starting with some recent version of macOS (I'm not sure which one, certainly not Catalina) the amount of used space can be queried via
getattrlist()'s new volume attributeATTR_VOL_SPACEUSED, which lets us display the correct Used space for APFS volumes. On systems that don't support this attribute duf will continue using the old approach.