src/vs/workbench/api/browser/mainThreadFileSystem.ts/RemoteFileSystemProvider/watch
class RemoteFileSystemProvider:	watch(resource: URI, opts: IWatchOptions) {
		const session = Math.random();
		this._proxy.$watch(this._handle, session, resource, opts);
		return toDisposable(() => {
			this._proxy.$unwatch(this._handle, session);
		});
	}