How to list DBFS tablespaces

@dbfs_create_filesystem

Hello,

   1) From database, how can we list all tablespaces which are DBFS (in despite their associated dbfs filesystem is umount) ?

   2) From database, how can we list the "DBFS" tablespaces associated to a  "store_mount" ( or to a "dbfs user")

       Because, when we execute this command :

               @dbfs_create_filesystem.sql <tablespace_name> <FS_name=store_mount>

       We searched hard to found where oracle store the tablespace associated to "store_mount" or to "dbfs user".

Thank you in advance.