Apex domains cannot have CNAME records.
Question and response
Question
dig fasosites.com. NS
Answer
fasosites.com. 5 NS sargent.ns.fasosites.com.
fasosites.com. 5 NS picasso.ns.fasosites.com.
fasosites.com. 5 NS leonardo.ns.fasosites.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0