A transaction can be RBF if itself is a RBF, or it spends outputs from a RBF transaction.
Is there a way to use bitcoin RPC node to check if a transaction is spending outputs from a RBF transcation?
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Based on Raghav Sood's answer, I found the more specific answer to the OP would be using
getmempoolentry, in order to get an individual transaction info. Otherwise you'll be flooded with tons of transactions. Documented here
You can also use
gettransaction, it returns
bip125-replaceable flag as well, however just for Bitcore prior to 0.10.0 according to this