Code:
MaxLumi2:/ $ ls -l /sbin
ls: /sbin: No such file or directory
MaxLumi2:/ $ mount|grep magisk
...
MaxLumi2:/ $ which su
/system/bin/su
MaxLumi2:/ $ ls -lZ /system/bin/su
lrwxrwxrwx 1 root root u:object_r:system_file:s0 8 1970-01-01 02:39 /system/bin/su -> ./magisk
MaxLumi2:/ $ dmesg|grep denied.*su
dmesg: klogctl: Permission denied
MaxLumi2:/ $