Apex domains cannot have CNAME records.
Question and response
Question
dig serveriai.lt. NS
Answer
serveriai.lt. 5 NS ns3.serveriai.lt.
serveriai.lt. 5 NS ns1.serveriai.lt.
serveriai.lt. 5 NS ns2.serveriai.lt.
serveriai.lt. 5 NS ns4.serveriai.lt.
Authority
The response has no authority records.
Additional
ns1.serveriai.lt. 5 A 79.98.25.142
ns2.serveriai.lt. 5 A 79.98.29.142
ns3.serveriai.lt. 5 A 162.159.24.19
ns4.serveriai.lt. 5 A 162.159.25.253
ns3.serveriai.lt. 5 AAAA 2400:cb00:2049:1:0:0:a29f:1813
ns4.serveriai.lt. 5 AAAA 2400:cb00:2049:1:0:0:a29f:19fd
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0