code: func (c *Client) IsFileLockable(path string) bool {
  	return c.getLockableFilter().Allows(path)
  }
docs: // IsFileLockable returns whether a specific file path is marked as Lockable,
  // ie has the 'lockable' attribute in .gitattributes
  // Lockable patterns are cached once for performance, unless you call RefreshLockablePatterns
  // path should be relative to repository root