Apex domains cannot have CNAME records.
Question and response
Question
dig winetbrasil.com.br. NS
Answer
winetbrasil.com.br. 4 NS ns2.winetbrasil.com.br.
winetbrasil.com.br. 4 NS ns1.winetbrasil.com.br.
Authority
The response has no authority records.
Additional
ns1.winetbrasil.com.br. 4 A 138.99.61.20
ns2.winetbrasil.com.br. 4 A 138.99.62.20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0