Apex domains cannot have CNAME records.
Question and response
Question
dig 0-28.102.142.95.in-addr.arpa. NS
Answer
0-28.102.142.95.IN-ADDR.ARPA. 5 NS ns2.quanza.eu.
0-28.102.142.95.IN-ADDR.ARPA. 5 NS ns1.quanza.net.
Authority
The response has no authority records.
Additional
ns1.quanza.net. 5 A 91.208.87.53
ns1.quanza.net. 5 AAAA 2a04:a500:1337:732:0:0:0:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0