{
 "Version":"2012-10-17",
 "Statement": [
  {
     "Sid": "AllowRootAndHomeListingOfCompanyBucket",
     "Action": ["s3:ListBucket"],
     "Effect": "Allow",
     "Resource": ["arn:aws:s3:::SomeBucket"],
     "Condition":{"StringEquals":{"s3:prefix":["","SomeDir/"],"s3:delimiter":["/"]}}
    },
   {
     "Sid": "AllowListingOfUserFolder",
     "Action": ["s3:ListBucket"],
     "Effect": "Allow",
     "Resource": ["arn:aws:s3:::SomeBucket"],
     "Condition":{"StringLike":{"s3:prefix":["SomeDir/*"]}}
   },
   {
     "Sid": "AllowAllS3ActionsInUserFolder",
     "Effect": "Allow",
     "Action": ["s3:*"],
     "Resource": ["arn:aws:s3:::SomeBucket/SomeDir/*"]
   }
 ]
}