I have a vcf file with 3 samples and would like to filter genotype(GT) variants that are the same across all 3 samples (Ex. 0/1 0/1 0/1). I am looking for differences between the 3 samples and want only variants that are different between the 3 samples (Ex. 0/0 0/0 0/1). Most of my genotypes are heterozygous. Does anyone have suggestions on how to do this?