module Sprockets::PathUtils

def path_parents(path, root = nil)

Returns an Array of String paths.

root - String path to stop at (default: system root)
path - String absolute filename or directory

Internal: Returns all parents for path 
def path_parents(path, root = nil)
  root = "#{root}#{File::SEPARATOR}" if root
  parents = []
  loop do
    parent = File.dirname(path)
    break if parent == path
    break if root && !path.start_with?(root)
    parents << path = parent
  end
  parents
end