code: public static CreateFileContext mergeFrom(CreateFilePOptions.Builder optionsBuilder) {
      CreateFilePOptions masterOptions =
          FileSystemOptions.createFileDefaults(ServerConfiguration.global());
      CreateFilePOptions.Builder mergedOptionsBuilder =
          masterOptions.toBuilder().mergeFrom(optionsBuilder.build());
      return new CreateFileContext(mergedOptionsBuilder);
    }
docs: Merges and embeds the given {@link CreateFilePOptions} with the corresponding master options.
  
  @param optionsBuilder Builder for proto {@link CreateFilePOptions} to embed
  @return the instance of {@link CreateFileContext} with default values for master