If you list this aws key, you will notice it is a folder:
aws s3 ls s3://sentinel-s2-l1c/tiles/38/L/PH/2017/12/15/0/ --request-payer requester
PRE auxiliary/
PRE preview/
PRE qi/
2017-12-15 15:00:21 3771735 B01.jp2
2017-12-15 15:00:21 104056631 B02.jp2
2017-12-15 15:00:21 107502080 B03.jp2
2017-12-15 15:00:21 115073992 B04.jp2
2017-12-15 15:00:21 31949594 B05.jp2
2017-12-15 15:00:21 33397280 B06.jp2
2017-12-15 15:00:21 33847035 B07.jp2
2017-12-15 15:00:21 120535153 B08.jp2
2017-12-15 15:00:21 3255340 B09.jp2
2017-12-15 15:00:21 1934849 B10.jp2
2017-12-15 15:00:21 32865167 B11.jp2
2017-12-15 15:00:21 32012158 B12.jp2
2017-12-15 15:00:21 33860198 B8A.jp2
2017-12-15 15:00:21 135040041 TCI.jp2
2017-12-15 15:00:21 630253 metadata.xml
2017-12-15 15:00:21 165600 preview.jp2
2017-12-15 15:00:35 121020 preview.jpg
2017-12-15 15:00:32 1039 productInfo.json
2017-12-15 15:00:21 1496 tileInfo.json