code: public static CreateDirectoryContext mergeFrom(CreateDirectoryPOptions.Builder optionsBuilder) {
      CreateDirectoryPOptions masterOptions =
          FileSystemOptions.createDirectoryDefaults(ServerConfiguration.global());
      CreateDirectoryPOptions.Builder mergedOptionsBuilder =
          masterOptions.toBuilder().mergeFrom(optionsBuilder.build());
      return create(mergedOptionsBuilder);
    }
docs: Merges and embeds the given {@link CreateDirectoryPOptions} with the corresponding master
  options.
  
  @param optionsBuilder Builder for proto {@link CreateDirectoryPOptions} to merge with defaults
  @return the instance of {@link CreateDirectoryContext} with default values for master