# File lib/rbvmomi/vim/Folder.rb, line 166
  def inventory_tree propSpecs={}
    inv = inventory_flat propSpecs
    children = inv.values.group_by { |v| v['parent'] }
    rec = lambda { |parent| Hash[(children[parent]||[]).map { |x| [x, rec[x.obj]] }] }
    rec[self]
  end