Get path to capistrano shared path from ruby

I know that I can get the location of my rails app with Rails.root:

> Rails.root
 => #<Pathname:/var/www/app-name/releases/20150507181426>

I am looking for the function to call to get capistrano's shared folder, which in this case is found here:

/var/www/app-name/shared/

I need to be able to get the path from within ruby code. Thanks in advance.