D3.js强制布局：显示任何节点的根路径

I am using force layout of d3.js and I need to show the path to the root in graph. Ex- On click of "Task 10" node it should show the path (Task 10->Task 6-> Task 4-> Task 1). Root will be recognize as same source and target but this info I am passing in data only. My data contain "RootPath" having path info for the node like for "Task 10" RootPath is ["Task 6","Task 4","Task 1"] . I am using force layout of d3.js and I need to