What are the sharingd and sharedfilelistd processes?
In a nutshell, sharedfileslistd is an XPC helper agent that provides SharedFilesLists private API in CoreServices that gets called by, for instance, by LaunchServices APIs and works with so-called SharedFilesLists - special property lists that contain NSURL BookmarkData entries. These are used for recent documents/servers/hosts that you see in Apple->Recent Items menu, Favourites/iCloud items/Bonjour hosts that appear in the Finder sidebar, Recent Documents in applications' Save/Open dialogs) and such.

sharingd is sharing daemon that enables AirDrop, Handoff, Instant Hotspot, Shared Computers, and Remote Disc in the Finder.