Luggage check in in Shekou ferry and claim in Nanjing via HK airport

I will fly from HK airport to Nanjing with Cathy Pacific. I will take the ferry in Shekou to get to HK airport. Can I check in my luggage in Shekou and get it back in Nanjing or is there a need to get the luggage back at HK airport ferry terminal and check in at the HK airport. Best Regards