The fstype argument to the mount system call can be null. To see an
example run "strace -e trace=mount unshare -m":
```
mount("none", "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0
...
```
93ac87c1bdJonathan Marler committed on 7/5/2022, 7:04:31 PM· committed by Andrew Kelleyparent86570b3