unCheckParents(node) {
    let parent = node._parent
    while (parent) {
      const next = this.getNodeById(parent)
      next.checked = false
      next.partial = getPartialState(next, '_children', this.getNodeById.bind(this))
      parent = next._parent
    }
  }
Walks up the tree unchecking parent nodes
@param  {[type]} node [description]
@return {[type]}      [description]