Running First Aid on “Macintosh HD” (disk1s1)
Verifying the startup volume will cause this computer to stop responding.
Verifying file system.
Volume could not be unmounted.
Using live mode.
Performing fsck_apfs -n -l -x /dev/rdisk1s1
Checking the container superblock.
Checking the EFI jumpstart record.
Checking the space manager.
Checking the space manager free queue trees.
Checking the object map.
Checking volume.
Checking the APFS volume superblock.
The volume Macintosh HD was formatted by asr (1412.120.2) and last modified by apfs_kext (1412.141.1).
Checking the object map.
Checking the snapshot metadata tree.
Checking the snapshot metadata.
Checking snapshot 1 of 10 (com.apple.TimeMachine.2020-10-14-163353.local)
Checking snapshot 2 of 10 (com.apple.TimeMachine.2020-10-14-195344.local)
Checking snapshot 3 of 10 (com.apple.TimeMachine.2020-10-14-212952.local)
Checking snapshot 4 of 10 (com.apple.TimeMachine.2020-10-15-073842.local)
Checking snapshot 5 of 10 (com.apple.TimeMachine.2020-10-15-102514.local)
Checking snapshot 6 of 10 (com.apple.TimeMachine.2020-10-15-120252.local)
Checking snapshot 7 of 10 (com.apple.TimeMachine.2020-10-15-130219.local)
Checking snapshot 8 of 10 (com.apple.TimeMachine.2020-10-15-140411.local)
Checking snapshot 9 of 10 (com.apple.TimeMachine.2020-10-15-150351.local)
Checking snapshot 10 of 10 (com.apple.TimeMachine.2020-10-15-160625.local)
Checking the extent ref tree.
Checking the fsroot tree.
Verifying allocated space.
The volume /dev/rdisk1s1 appears to be OK.
File system check exit code is 0.
Restoring the original state found as mounted.
Operation successful.