public Builder clearRootDirectory() {
        rootDirectory_ = getDefaultInstance().getRootDirectory();
        bitField0_ = (bitField0_ & ~0x00000001);
        onChanged();
        return this;
      }
<pre>
Root directory path to the filesystem.
</pre>

<code>string root_directory = 1;</code>

@return This builder for chaining.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java