Unable to change directories when exposed via Mina SFTP

[thomascollett]

When using s3fs as a file system for Mina SFTP, i'm unable to change directory (cd):

sftp> ls -l
d---------   1 OWNER@   GROUP@          0 Jan 25 10:51 bar
d---------   1 OWNER@   GROUP@          0 Jan 25 10:42 foo
sftp> cd foo
Can't change directory: Can't check target

POSIX permissions are not being returned for these directories, which is causing an exception in the SFTP client when attempting to cd to the directory. This is fixed by:
#96

Versions:

<dependencies>
      <dependency>
        <groupId>org.apache.sshd</groupId>
        <artifactId>sshd-core</artifactId>
        <version>1.6.0</version>
      </dependency>   

      <dependency>
        <groupId>com.upplication</groupId>
        <artifactId>s3fs</artifactId>
        <version>2.2.1</version>
      </dependency>
</dependencies>

My file system factory looks like:

FileSystem fileSystem = FileSystems.newFileSystem(
  URI.create("s3://s3-eu-west-1.amazonaws.com/"),
  ImmutableMap.of(),
  Thread.currentThread().getContextClassLoader());

Path bucketPath = fileSystem.getPath("/" + bucketName + "/");
return new VirtualFileSystemFactory(bucketPath);