How do I view root ( / ) with Termux if termux-setup-storage doesn’t help?

After reviewing this, I used termux-setup-storage on my phone and Andy Android emulator.

After running the above command, I am able to view root directory with ls on Andy emulator but not on phone.

Android version 7.1.1
Xperia XZ
SoftBank locked the phone BIOS (or whatever it was) so I can’t root it.
Storage permissions are granted.

What else can I try to use ls on root directory on my phone?