shops.myshopify.com has no NS records.
NS records for this zone are defined at myshopify.com.
NS records for this zone are defined at myshopify.com.
Question and response
Question
dig shops.myshopify.com. NS
Answer
The response has no answer records.
Authority
myshopify.com. 3600 SOA ns1.dnsimple.com. admin.dnsimple.com. 1477078353 86400 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0