Duf doesn't understand MacOS APFS volumes. I have two such volumes sharing my primary SSD. For those accustomed to more primitive file systems, one doesn't have

Duf doesn't understand MacOS APFS volumes. I have two such volumes sharing my primary SSD. For those accustomed to more primitive file systems, one doesn't have to arbitrarily divide a drive into volumes of separate fixed sizes. Volumes on an APFS drive can share pooled free space. My two volumes sharing a drive have separate percentages that look quite healthy, but their combined percentage reveals that I am perilously short on space. Duf doesn't know to combine these percentages. DaisyDisk (a wonderful GUI app for managing MacOS disk space) makes the problem clear.