Rails 4.2.0, RSpec 3.1, SimpleCov 0.9.2

I have the following in my rails_helper.rb file, outside of the RSpec.configure block

require 'simplecov'
SimpleCov.start 'rails' do
  add_filter '/app/models/legacy/'
  add_filter '/app/controllers/playlists_controller_legacy.rb'
  add_filter '/app/models/login.rb'
  add_filter '/app/models/login_auth.rb'
  add_filter '/app/models/login_config.rb'
end

I have read online that some people find running spring rspec returns high or even 100% coverage. It does not seem that way for our app, but I would just like to make sure. The LOC count seems a little low (short by 1000 maybe?), although again that could be from recent refactoring I have not viewed the commits for.

And my config/spring.rb file contains nothing about SimpleCov. Would I put the above configuration in the spring file itself, or under the Spring.after_fork block?