code: func compareDockerVersions(lhs, rhs dockerVersion) int {
  	switch {
  	case lhs.major < rhs.major:
  		return -1
  	case lhs.major > rhs.major:
  		return 1
  	case lhs.minor < rhs.minor:
  		return -1
  	case lhs.minor > rhs.minor:
  		return 1
  	}
  	return 0
  }
docs: // compareDockerVersions compares two docker api versions, 'lhs' and 'rhs', and returns -1 if lhs is less
  // than rhs, 0 if they are equal, and 1 if lhs is greater than rhs