in src/main/java/org/apache/sling/jcr/filetransfer/sftp/internal/DefaultChrootDirectoryProvider.java [48:53]
public String getChrootDirectory(@NotNull final Session session) {
final String username = session.getUsername();
final String chroot = String.format("/var/filetransfer/%s", username);
logger.info("providing chroot {} for user {}", chroot, username);
return chroot;
}