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ascend 

        # Pathname.ascend

(from ruby core)
---
    ascend() { |self| ... }

---

Iterates over and yields a new Pathname object for each element in the
given path in ascending order.

    Pathname.new('/path/to/some/file.rb').ascend {|v| p v}
       #<Pathname:/path/to/some/file.rb>
       #<Pathname:/path/to/some>
       #<Pathname:/path/to>
       #<Pathname:/path>
       #<Pathname:/>

    Pathname.new('path/to/some/file.rb').ascend {|v| p v}
       #<Pathname:path/to/some/file.rb>
       #<Pathname:path/to/some>
       #<Pathname:path/to>
       #<Pathname:path>

Returns an Enumerator if no block was given.

    enum = Pathname.new("/usr/bin/ruby").ascend
      # ... do stuff ...
    enum.each { |e| ... }
      # yields Pathnames /usr/bin/ruby, /usr/bin, /usr, and /.

It doesn't access the filesystem.

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