What directory is the parent of root 👨‍👦📁

I learned that in unix, root (e.g. /) is the only directory that is the parent directory of itself.

$ ls -lai / | grep '\./'
                  2 drwxr-xr-x   20 root  wheel   640 Jan  1  2020 ./
                  2 drwxr-xr-x   20 root  wheel   640 Jan  1  2020 ../

In the above example, the files . and .. both have the same i-node: 2

Source: Brian W. Kernighan, & Rob Pike (1984) The UNIX Programming Environment. Prentice-Hall, Inc

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