autofs keeps remounting

[Tobias Bocanegra]

i enabled autofs for smb. when i access the mountpoints, the are
mounted perfectly. and after the configured timeout, they are
unmounted again. but right after, they are mounted again. i suspect
some scanning-daemon, but i cannot point the finger on it.

auto.master:
  /mnt/smb        /etc/auto.smb --timeout=60  -v

syslog:
Aug  1 12:08:08 sulu automount[11903]: attempting to mount entry /mnt/smb/server
Aug  1 12:09:09 sulu automount[23701]: rm_unwanted: /mnt/smb/server/photos
Aug  1 12:09:09 sulu automount[23701]: rm_unwanted: /mnt/smb/server/data
Aug  1 12:09:09 sulu automount[23701]: rm_unwanted: /mnt/smb/server
Aug  1 12:09:09 sulu automount[23701]: expired /mnt/smb/server
Aug  1 12:09:09 sulu automount[11903]: attempting to mount entry /mnt/smb/server

does anybody know what causes this?
regards, toby