rniemeyer/knockout-sortable — pull request #40 by drdamour (2013-01-10 00:26:05+00:00)
Title: Update README.md

looking at the code it looks like the false value is intended to work this way, but doesn't seem to be documented. I found out about it from http://stackoverflow.com/questions/12408015/prevent-items-to-be-droppable-in-other-parent-child-elements. If this isn't intended behaviour, but just a side effect, then please dismiss this and indicate the "right" way to limit draggables to their existing container.