Multi-floor support

Hi there.
Trying to add support of multi-floor routing into graphhopper for later use on iOS platform for indoor navigation.
Can you point me to correct direction in implementing this task? Does graph already contains ‘level’ tags for each node/edge and I need to modify only GHRequest logic? If not - where does all graph creation is happening?
I also found EdgeFilter - could it help with this task?
Thank you very much

This would be a nice feature, see here what is necessary and where you find the relevant code:

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