I have only basic understanding of about mounting of filesystem and the mounting point.

Following is the result I run df -h:
Filesystem 512-blocks Used Available Capacity iused ifree %iused Mounted on
**/dev/disk3s1s1 965595304 20048096 891463112 3% 404167 4294084613 0% /
**devfs 393 393 0 100% 682 0 100% /dev
/dev/disk3s6 965595304 40 891463112 1% 0 4457315560 0% /System/Volumes/VM
/dev/disk3s2 965595304 12012392 891463112 2% 1058 4457315560 0% /System/Volumes/Preboot
/dev/disk3s4 965595304 18704 891463112 1% 50 4457315560 0% /System/Volumes/Update
/dev/disk2s2 1024000 12328 987496 2% 1 4937480 0% /System/Volumes/xarts
/dev/disk2s1 1024000 12552 987496 2% 23 4937480 0% /System/Volumes/iSCPreboot
/dev/disk2s3 1024000 1904 987496 1% 87 4937480 0% /System/Volumes/Hardware
**/dev/disk3s5 965595304 39904112 891463112 5% 324386 4457315560 0% /System/Volumes/Data
**map auto_home 0 0 0 100% 0 0 – /System/Volumes/Data/home

But when I go to the directory /Users and run df . it shows the following result:
onepunchman@Colins-MacBook-Air /Users % df .
Filesystem 512-blocks Used Available Capacity iused ifree %iused Mounted on
/dev/disk3s5 965595304 39895480 891471744 5% 324439 4457358720 0% /System/Volumes/Data

In my understanding, the directory /Users is under / and shouldn’t the command above return
**/dev/disk3s1s1 965595304 20048096 891463112 3% 404167 4294084613 0% /
instead?

Hope you guys can help me to understand a bit here. Great thanks!