How not to copy-paste 3 generic error responses in almost all paths?

I want almost all my paths to have the following 3 generic error responses. How do I describe that in Swagger without copypasting these lines everywhere?

    401:
      description: The requester is unauthorized.
      schema:
        $ref: '#/definitions/Error'
    500:
      description: "Something went wrong. It's server's fault."
      schema:
        $ref: '#/definitions/Error'
    503:
      description: Server is unavailable. Maybe there is maintenance?
      schema:
        $ref: '#/definitions/Error'

Example of how I use this in a request:

paths:
    /roles:
      get:
        summary: Roles
        description: |
          Returns all roles available for users.
        responses:
          200:
            description: An array with all roles.
            schema:
              type: array
              items:
                $ref: '#/definitions/Role'
          401:
            description: The requester is unauthorized.
            schema:
              $ref: '#/definitions/Error'
          500:
            description: "Something went wrong. It's server's fault."
            schema:
              $ref: '#/definitions/Error'
          503:
            description: Server is unavailable. Maybe there is maintenance?
            schema:
              $ref: '#/definitions/Error'