Laravel S3 filesystem setting server side encryption

Is it possible in Laravel 5.1 to set server side encryption in the S3 file storage?

Something like the following:

$s3 = Storage::disk('s3');
$s3->put($filename, file_get_contents($request->file('file')), 'private', 'AES-256'); 

I'm aware Laravel uses the flysystem library for this, but I can't seem to find any documentation regarding encryption.

via Chebli Mohamed