public com.google.storagetransfer.v1.proto.TransferTypes.PosixFilesystem.Builder
          getPosixDataSinkBuilder() {
        return getPosixDataSinkFieldBuilder().getBuilder();
      }
<pre>
A POSIX Filesystem data sink.
</pre>

<code>.google.storagetransfer.v1.PosixFilesystem posix_data_sink = 13;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java