question about identifying the file system on lvm

[Tapas Mishra]

Hi,
based on my search on internet I came to know that before I reduce the LVM size
I will have to reduce the file system size on it.
I am not very clear with identifying the partition type or filesystem
residing on it
here is what lvscan reports me

  ACTIVE            '/dev/virtualization/vm1' [100.00 GiB] inherit
  ACTIVE            '/dev/virtualization/vm2' [150.00 GiB] inherit
  ACTIVE            '/dev/virtualization/vm3' [50.00 GiB] inherit
  ACTIVE            '/dev/virtualization/vm4' [100.00 GiB] inherit

How can I identify the file system running on it.

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