Sorry if I'm late to the party. I am doing the inverse of what you're looking for.

https://github.com/r351574nc3/steem-bot-examples/blob/0f2867fd3f80c0c30f0271c05071d5c41363408a/auto-reply-steem-bot/app/helpers/bot/reply.js#L118

My example uses getDiscussionsByBlog to retrieve blog entries. I only wanted my unique entries, but the results were returning resteems.

I ended up writing this to filter out resteems

https://github.com/r351574nc3/steem-bot-examples/blob/0f2867fd3f80c0c30f0271c05071d5c41363408a/auto-reply-steem-bot/app/helpers/bot/reply.js#L41

If results.id == 0, that means it's a resteem. I used the inverted condition to filter those out. Hope this helps. You can run this periodically.