How to get current context name of RSpec?

if I have rspec like this

describe 'Foo' do
 # init go here
 describe 'Sub-Foo' do
    it "should Bar" do
       # test go here
       # puts ... <-- need "Foo.Sub-Foo should Bar" here 
    end
 end
end

How can I get "Foo.Sub-Foo should Bar" inside the test context at // test go here?

It is similar to format with specdocs, but how to get it inside itself?